isnan.m

function I = isnan(DEM)

% returns array elements that are NaNs as logical grid
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% Syntax
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%     I = isnan(DEM)
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% Description
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%     overloaded isnan for GRIDobj. 
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% See also: isnan
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% Author: Wolfgang Schwanghart (w.schwanghart[at]geo.uni-potsdam.de)
% Date: 20. February, 2013

I = DEM;
I.Z = isnan(DEM.Z);
I.name = [DEM.name ' (isnan)'];